I think everyone had that time where some1 dodges after ban phase or after some champ is picked. And then instantly you get another lobby but with the same people, or more often people in teams are exchanged.
Those people know champions you picked last lobby and are likely to ban them.
Also what often is the case if you accept 2nd lobby is getting your 2nd role instead.
This forces people to always deny queue after somebody dodges, or risk being out-banned/picked.
It would be nice if Riot considered this and not put people in the same lobby again or rush for new members and put people off role.